Holder for boring bits and the like



Dec. 28, 1965 A. FISCHER 3,225,846

HOLDER FOR BORING BITS AND THE LIKE Filed May 14, 1965 Fig.2 3

2a 8a 5 r:42a

"2Z1 x 7 \I 12 3 Fig.3

IN VEN TOR.

ARTUR FISCHER BY United States Patent 3,225,846 HOLDER FOR BORING BITSAND TEE LIKE Artur Fischer, Tumlingen, Kreis Freudenstadt, Black Forest,Germany Filed May 14-, 1963, Ser. No. 280,379 Claims priority,appiication Germany, May 16, 1962, F 36,820 9 Claims. ((11. 175-403) Thepresent invention relates to a handle for boring bits and similar toolswhich may be utilized to form expansion anchor holes in concrete, brick,plaster and other types of brittle construction material. Moreparticularly, the invention relates to a handle which may be used toalternatively support two or more differently dimensioned boring tools.

It is an important object of my invention to provide a very simple,compact, inexpensive and lightweight handle which may be rapidlyconnected with or disconnected from a boring bit or a similar tool,which is without moving parts, and which may be manipulated by personshaving little or no skill.

Another object of the invention is to provide a handle of the justoutlined characteristics which may be used in connection with heavy-dutyor regular boring bits, which can withstand hammer blows and similarstresses such as are being transmitted thereto when a boring tool is inactual use, and which may be manufactured of readily available materialsother than metal.

A further object of the invention is to provide a device which includesa boring bit and a handle of the above outline characteristics.

With the above objects in view, one feature of my invention resides inthe provision of a handle which preferably consists of one piece ofblow-resistant synthetic plastic material (e.g., nylon) and which isarranged to alternatively support two or more boring bits or similartools of the type having an elongated tubular or solid rod shaped endportion and a projection extending radially or tangentially of such endportion. The handle comprises two or more elongated sections each ofwhich may serve as a handgrip member and each of which is formed with atleast one transversely extending bore and with a slot which communicateswith the respective bore. The diameters or the transverse dimensions ofthe bores are different so that each thereof may receive the end portionof a differently dimensioned tool. The projections of the tools thenextend into the respective slots to prevent rotation of such tools withrespect to the handle. The arrangement is preferably such that the endportion of a tool must be driven into and is then wedged into therespective section to prevent accidental axial displacements of thetool.

The novel features which are considered as characteristic of theinvention are set forth in particular in the appended claims. Theimproved handle itself, however, both as to its construction and themethod of using the same, together with additional features andadvantages thereof, will be best understood from the following detaileddescription of certain specific embodiments with reference to theaccompanying drawings, in which:

FIG. 1 is perspective view of a handle which embodies my invention andwhich supports a tubular boring bit while the latter forms an expansionanchor hole in a concrete wall or a similar piece of masonry;

FIG. 2 is a longitudinal central section as seen in the direction ofarrows from the line IIII of FIG. 1;

FIG. 3 is a smaller-scale plan view of a blank which may be transformedinto a boring bit of the type shown in FIGS. 1 and 2; and

FIG. 4 is a fragmentary and elevational view of a modified handle andshows a prong-like section which is formed with two bores each adaptedto receive the end portion of a differently dimensioned solid rod shapedbit.

Referring now in greater detail to FIGS. 1 and 2, the handle or holder Hof my invention assumes the form of a flat substantially V-shaped bodyof strong blow-resistant synthetic plastic material which comprises twomutually inclined coplanar sections or prongs 1, 2. For example, thehandle may be made of nylon which is a material capable of resistingblows by a hammer or a similar tool.

The free end portions of the prongs 1 and 2 are respectively formed withtransversely extending bores 3 and 4 whose axes are parallel with thegeneral plane of the handle and which are inclined with reference toeach other so that the imaginary extensions of their axes make the sameangle as the prongs. In the illustrated embodiment, the bores 3 and 4are through bores but it is equally possible to form the prongs withblind bores as long as the axial length of the bores is sufficient toinsure satisfactory retention of the bit. The prongs 1 and 2 are furtherprovided with elongated slots 3a, 4a which communicate with and whichare substantially tangential to the respective bores. The diameters ofthe bores 3 and 4 are different so that each thereof may accommodate therear end portion of a differently dimensioned bit. FIGS. 1 and 2 show anelongated tubular boring bit 5 which is formed with a narrowlongitudinally extending slit 5a and whose cutting portion 7 at itsfront end is formed with annularly arranged teeth adapted to penetrateinto the exposed surface of a masonry structure 8 to form therein a holedo for reception of an expansion anchor or the like. That portion 5b ofthe bit 5 which is adjacent to its rear end is provided with anelongated substantially tangential flat projection or lug 6 serving as ameans to hold the bit against rotation with respect to the holder H andto simultaneously prevent undesirable axial movements of the bit. Theend portion 512 is fitted into the bore 4 and the projection 6 isreceived in the slot 4a. As shown in FIG. 2, the length of theprojection 6 may equal or even exceed the length of the bore 4.

The bit 5 may be formed in the following way: A rectangular blank 10(see FIG. 3) is stamped out of a sheet of tool steel by leaving a lug11a along one edge portion 11 of the blank. The blank is thereuponrolled into a tube to form the body of the bit whereby the lugconstitutes the projection 6. A second edge portion 12 of the blank isformed with teeth so that the material which is adjacent to this secondedge portion 12 constitutes the cutting portion 7 of the finished bit.

Referring again to FIGS. 1 and 2, the masonry construction 3 is a wallconsisting of brick, concrete, plaster or another comparatively brittlematerial which cannot directly retain a screw, a threaded bolt or asimilar fastening device. When the handle H is to be put to actual use,the operator inserts the trailing end portion 5b of the bit 5 into thebore 4 in such a way that the projection 6 extends into the slot 40. Asa rule, the width of the slot 4a is somewhat less than the thickness ofthe projection 6 so that the latter must be forced into the slot 4a andis wedged in the prong 2 to prevent undesirable axial movements of thebit. For example, the width of the slots 3a, 4a may diminish in adirection from the one toward the other axial end of the respectivebore.

()nce the bit 5 is properly wedged in the position of FIG. 1 or 2, theoperator grasps the prong 1 with one hand and, by holding a hammer or asimiiar driving tool, strikes against the prong 2 (arrow 13) to form theexpansion anchor hole 8a.

The position of the handle H is reversed when the operator decides touse a second bit whose trailing end portion is received in the bore 3.Of course, the operator will expsi the bit from its bore before hedecides to connect the prong 1 with a smaller-diameter bit so that thebit 5 cannot interfere with the next boring operation. As a rule, thetrailing portion of a bit is driven into the respective bore with thehelp of a hammer and its projection is finally clamped or wedged in therespective slot while the cutting portion penetrates into the materialof the masonry structure 8. Alternatively, and referring again to FIGS.1 and 2, the surface 2a of the prong 2 may be placed onto a rigidsupport (not shown) so that the ends of the bore i remain exposed. Theoperator then introduces the cutting portion '7 into the right-hand endof the bore 4 (reference being had to FIG. 2) and uses a hammer to drivethe projection 6 into the slot 411.

If desired, at least one prong of the handle H may be formed with two ormore bores, particularly if the prongs are comparatively long. This isshown in FIG. 4 which illustrates a prong 22 with a larger-diameter bore24 and a smaller-cliameter bore 24'. These bores respectivelycommunicate with radiaily extending slots 24a, 24a and are parallel toeach other. Such handle may serve as a holder for three or moredifferently dimensioned bits. Furthermore, the handle may comprise threeor more prongs and, instead of being inclined with reference to eachother, the prongs 1, 2 may form a pair of aligned sections one of whichconsitiutes the handgrip member and the other of which constitutes thetool supporting member of the handle.

The handle of my invenaion is equally practical for use as a means foralternatively supporting two or more heavy-duty bits which consist ofsolid steel rod stock. If such heavy duty bits are provided with radialprojections (see the solid bit 25 which is shown in section in FIG. 4)the slots (24a, 24a) in the corresponding prongs extend radially of therespective bores (24, 24). Finally, it is equally within the purview ofmy invention to omit the projection 6 and to form the prongs 1 and 2with ribs or projections which extend into the respective bores so as tobe received in the slit 5:: of the respective boring bit. Thismodification will be readily comprehended by men skilled in this artwithout necessitating additional illustrations.

Without further analysis, the foregoing will so fully reveal the gist ofthe present invention that others can, by applying current knowledge,readily adapt it for various applications without omitting featuresthat, from the standpoint of prior art, fairly constitute essentialcharacteristics of the generic and specific aspects of this inventionand, therefore, such adaptations should and are intended to becomprehended within the meaning and range of equivalence of thefollowing claim.

What is claimed as new and desired to be secured by Letters Patent is:

1. A handle for boring bits and similar tools of the type having anelongated end portion and a projection extending laterally of such endportion, said handle consisting of a single piece of blow-resistantsynthetic plastic material and comprising a pair of mutually inclinedelongated prongs each having a transversely extending through bore andan elongated slot parallel to and communicating with the respectivebore, said bores having different diameters so that each thereof mayaccommodate the end portion of a differently dimensioned tool wherebythe projection of the tool extends into the respective slot to preventrotation of the tool with respect to the handle.

2. A handle for boring bits and similar tools of the type having anelongated end portion and a projection extending laterally of such endportion, said handle consisting of a single piece of blow-resistantsynthetic plastic material and comprising a pair of mutually inclinedelongated coplanar prongs each having a transversely extending throughbore and an elongated slot parallel to and communicating with therespective bore, said bores having mutually inclined axes disposed inthe common plane of said prongs and having diiferent diameters so thateach thereof may accommodate the end portion of a differentlydimensioned tool whereby the projection of the tool extends into therespective slot to prevent rotation of the tool with respect to thehandle.

3. A handle as set forth in claim 2 wherein each of said bores islocated in close proximity to that end of the respective prong which isspaced from the other prong.

4. A device of the character described comprising a handle consisting ofone piece of blow-resistant synthetic plastic material and having aplurality of mutually inclined elongated coplanar sections each of whichmay serve as a handgrip member, at least one of said sections having aportion provided with a bore; and a boring bit having an end portionreceived in said bore, one of said portions having a slot and the otherof said portions comprising a projection extending into said slot sothat the bit is held against rotation with respect to the handle.

5. A device as set forth in claim 4, wherein the width of said slot issuch that the projection is wedged therein to hold the bit againstaccidental axial displacement.

6. A device as set forth in claim 4, wherein each of said sections has aportion which is provided with a bore and wherein the diameters of saidbores are different so that each thereof may receive the end portion ofa differently dimensioned tool.

7. A device as set forth in claim 4, wherein said bit is of tubularshape and has an axially parallel slit.

8. A device as set forth in claim 4, wherein said bit is a solid rod.

9. A handle for boring bits and similar tools of the type having anelongated end portion and a flat projection extending tangentially ofsuch end portion, said handle consisting of a single piece ofblow-resistant synthetic plastic material and comprising a pair ofmutually inclined elongated coplanar prongs each having at least onetransversely extending through bore and an elongated slot extendingtangentially of and communicating with the respective bore, said boreshaving difierent diameters so that each thereof may accommodate the endportion of a differently dimensioned tool whereby the projection of thetool extends into the respective slot to prevent rotation of the toolwith respect to the handle, said bores and said slots being dimensionedin such a way that the end portions and the projections of therespective tools are wedged therein to prevent accidental axialdisplacement of the tool.

References Cited by the Examiner UNITED STATES PATENTS 239,958 4/1881Inrnan 287-203 423,951 3/1890 Poind-exter 279-l02 2,058,618 10/1936Patzig 28720.3 2,146,415 2/1939 Bradley 61.12 2,724,596 11/1955 Murrayet al. 279-14 CHARLES E. OCONNELL, Primary Examiner.

CARL W. TOMLIN, BENJAMIN HERSH, Examiners.

1. A HANDLE FOR BORING BITS AND SIMILAR TOOLS OF THE TYPE HAVING ANELONGATED END PORTION AND A PORJECTION EXTENDING LATERALLY OF SUCH ENDPORTION, SAID HANDLE CONSISTING OF A SINGLE PIECE OF BLOW-RESISTANTSYNTHETIC PLASTIC MATERIAL AND COMPRISING A PAIR OF MUTUALLY INCLINEDELONGATED PRONGS EACH HAVING A TRANSVERSELY EXTENDING THROUGH BORE ANDAN ELONGATED SLOT PARALLEL TO AND COMMUNICATING WITH THE RESPECTIVEBORE, SAID BORES HAVING DIFFERENT DIAMETERS SO THAT EACH THEREOF MAYACCOMMODATE THE END PORTION OF A DIFFERNTLY DIMENSIONED TOOL WHEREBY THEPROJECTION OF THE TOOL EXTENDS INTO THE RESPECTIVE SLOT TO PREVENTROTATION OF THE TOOL WITH RESPECT TO THE HANDLE.